82 lines
3 KiB
Python
82 lines
3 KiB
Python
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# Utilities for asynchronous calls.
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#
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# Copyright (C) 2017 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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from queue import Queue
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from pyanaconda.core.threads import thread_manager
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from pyanaconda.core.glib import idle_add
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def run_in_loop(callback, *args, **kwargs):
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"""Run callback in the main thread."""
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idle_add(callback, *args, **kwargs)
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def async_action_wait(func):
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"""Decorator method which ensures every call of the decorated function to be
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executed in the context of GLib main loop even if called from a non-main
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thread and returns the ret value after the decorated method finishes.
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"""
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queue_instance = Queue()
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def _idle_method(queue_instance, args, kwargs):
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"""This method contains the code for the main loop to execute.
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"""
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ret = func(*args, **kwargs)
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queue_instance.put(ret)
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return False
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def _call_method(*args, **kwargs):
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"""The new body for the decorated method. If needed, it uses closure
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bound queue_instance variable which is valid until the reference to this
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method is destroyed."""
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if thread_manager.in_main_thread():
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# nothing special has to be done in the main thread
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return func(*args, **kwargs)
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run_in_loop(_idle_method, queue_instance, args, kwargs)
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return queue_instance.get()
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return _call_method
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def async_action_nowait(func):
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"""Decorator method which ensures every call of the decorated function to be
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executed in the context of GLib main loop even if called from a non-main
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thread. The new method does not wait for the callback to finish.
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"""
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def _idle_method(args, kwargs):
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"""This method contains the code for the main loop to execute.
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"""
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func(*args, **kwargs)
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return False
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def _call_method(*args, **kwargs):
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"""The new body for the decorated method.
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"""
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if thread_manager.in_main_thread():
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# nothing special has to be done in the main thread
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func(*args, **kwargs)
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return
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run_in_loop(_idle_method, args, kwargs)
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return _call_method
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